堤防施工中,选择的外帮土料的渗透系数须( )原堤身土料的渗透系数。
A.大于
B.大于或等于
C.小于
D.小于或等于
参考答案:D
用汽车运49.5吨货物,已经运了36吨,剩下的每车运4.5吨,还要几车才能运完?
I was so familiar with her that I recognized her voice ______ I picked up the phone.
[ ]
A. the moment
B. after
C. before
D. while